2 * Copyright(c) 2007 Intel Corporation. All rights reserved.
3 * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
4 * Copyright(c) 2008 Mike Christie
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
19 * Maintained at www.Open-FCoE.org
22 #include <linux/module.h>
23 #include <linux/delay.h>
24 #include <linux/kernel.h>
25 #include <linux/types.h>
26 #include <linux/spinlock.h>
27 #include <linux/scatterlist.h>
28 #include <linux/err.h>
29 #include <linux/crc32.h>
30 #include <linux/slab.h>
32 #include <scsi/scsi_tcq.h>
33 #include <scsi/scsi.h>
34 #include <scsi/scsi_host.h>
35 #include <scsi/scsi_device.h>
36 #include <scsi/scsi_cmnd.h>
38 #include <scsi/fc/fc_fc2.h>
40 #include <scsi/libfc.h>
41 #include <scsi/fc_encode.h>
45 static struct kmem_cache *scsi_pkt_cachep;
47 /* SRB state definitions */
48 #define FC_SRB_FREE 0 /* cmd is free */
49 #define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
50 #define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
51 #define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
52 #define FC_SRB_ABORTED (1 << 3) /* abort acknowledged */
53 #define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
54 #define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
55 #define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
57 #define FC_SRB_READ (1 << 1)
58 #define FC_SRB_WRITE (1 << 0)
61 * The SCp.ptr should be tested and set under the scsi_pkt_queue lock
63 #define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
64 #define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
65 #define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
66 #define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
67 #define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
70 * struct fc_fcp_internal - FCP layer internal data
71 * @scsi_pkt_pool: Memory pool to draw FCP packets from
72 * @scsi_queue_lock: Protects the scsi_pkt_queue
73 * @scsi_pkt_queue: Current FCP packets
74 * @last_can_queue_ramp_down_time: ramp down time
75 * @last_can_queue_ramp_up_time: ramp up time
76 * @max_can_queue: max can_queue size
78 struct fc_fcp_internal {
79 mempool_t *scsi_pkt_pool;
80 spinlock_t scsi_queue_lock;
81 struct list_head scsi_pkt_queue;
82 unsigned long last_can_queue_ramp_down_time;
83 unsigned long last_can_queue_ramp_up_time;
87 #define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
91 * FC scsi I/O related functions
93 static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
94 static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
95 static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
96 static void fc_fcp_complete_locked(struct fc_fcp_pkt *);
97 static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
98 static void fc_fcp_error(struct fc_fcp_pkt *, struct fc_frame *);
99 static void fc_fcp_recovery(struct fc_fcp_pkt *, u8 code);
100 static void fc_fcp_timeout(unsigned long);
101 static void fc_fcp_rec(struct fc_fcp_pkt *);
102 static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
103 static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
104 static void fc_io_compl(struct fc_fcp_pkt *);
106 static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
107 static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
108 static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
111 * command status codes
113 #define FC_COMPLETE 0
114 #define FC_CMD_ABORTED 1
115 #define FC_CMD_RESET 2
116 #define FC_CMD_PLOGO 3
118 #define FC_TRANS_ERR 5
119 #define FC_DATA_OVRRUN 6
120 #define FC_DATA_UNDRUN 7
122 #define FC_HRD_ERROR 9
123 #define FC_CRC_ERROR 10
124 #define FC_TIMED_OUT 11
127 * Error recovery timeout values.
129 #define FC_SCSI_TM_TOV (10 * HZ)
130 #define FC_HOST_RESET_TIMEOUT (30 * HZ)
131 #define FC_CAN_QUEUE_PERIOD (60 * HZ)
133 #define FC_MAX_ERROR_CNT 5
134 #define FC_MAX_RECOV_RETRY 3
136 #define FC_FCP_DFLT_QUEUE_DEPTH 32
139 * fc_fcp_pkt_alloc() - Allocate a fcp_pkt
140 * @lport: The local port that the FCP packet is for
141 * @gfp: GFP flags for allocation
143 * Return value: fcp_pkt structure or null on allocation failure.
144 * Context: Can be called from process context, no lock is required.
146 static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
148 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
149 struct fc_fcp_pkt *fsp;
151 fsp = mempool_alloc(si->scsi_pkt_pool, gfp);
153 memset(fsp, 0, sizeof(*fsp));
155 fsp->xfer_ddp = FC_XID_UNKNOWN;
156 atomic_set(&fsp->ref_cnt, 1);
157 init_timer(&fsp->timer);
158 fsp->timer.data = (unsigned long)fsp;
159 INIT_LIST_HEAD(&fsp->list);
160 spin_lock_init(&fsp->scsi_pkt_lock);
162 per_cpu_ptr(lport->stats, get_cpu())->FcpPktAllocFails++;
169 * fc_fcp_pkt_release() - Release hold on a fcp_pkt
170 * @fsp: The FCP packet to be released
172 * Context: Can be called from process or interrupt context,
173 * no lock is required.
175 static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
177 if (atomic_dec_and_test(&fsp->ref_cnt)) {
178 struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
180 mempool_free(fsp, si->scsi_pkt_pool);
185 * fc_fcp_pkt_hold() - Hold a fcp_pkt
186 * @fsp: The FCP packet to be held
188 static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
190 atomic_inc(&fsp->ref_cnt);
194 * fc_fcp_pkt_destory() - Release hold on a fcp_pkt
195 * @seq: The sequence that the FCP packet is on (required by destructor API)
196 * @fsp: The FCP packet to be released
198 * This routine is called by a destructor callback in the exch_seq_send()
199 * routine of the libfc Transport Template. The 'struct fc_seq' is a required
200 * argument even though it is not used by this routine.
202 * Context: No locking required.
204 static void fc_fcp_pkt_destroy(struct fc_seq *seq, void *fsp)
206 fc_fcp_pkt_release(fsp);
210 * fc_fcp_lock_pkt() - Lock a fcp_pkt and increase its reference count
211 * @fsp: The FCP packet to be locked and incremented
213 * We should only return error if we return a command to SCSI-ml before
214 * getting a response. This can happen in cases where we send a abort, but
215 * do not wait for the response and the abort and command can be passing
216 * each other on the wire/network-layer.
218 * Note: this function locks the packet and gets a reference to allow
219 * callers to call the completion function while the lock is held and
220 * not have to worry about the packets refcount.
222 * TODO: Maybe we should just have callers grab/release the lock and
223 * have a function that they call to verify the fsp and grab a ref if
226 static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
228 spin_lock_bh(&fsp->scsi_pkt_lock);
229 if (fsp->state & FC_SRB_COMPL) {
230 spin_unlock_bh(&fsp->scsi_pkt_lock);
234 fc_fcp_pkt_hold(fsp);
239 * fc_fcp_unlock_pkt() - Release a fcp_pkt's lock and decrement its
241 * @fsp: The FCP packet to be unlocked and decremented
243 static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
245 spin_unlock_bh(&fsp->scsi_pkt_lock);
246 fc_fcp_pkt_release(fsp);
250 * fc_fcp_timer_set() - Start a timer for a fcp_pkt
251 * @fsp: The FCP packet to start a timer for
252 * @delay: The timeout period in jiffies
254 static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
256 if (!(fsp->state & FC_SRB_COMPL))
257 mod_timer(&fsp->timer, jiffies + delay);
261 * fc_fcp_send_abort() - Send an abort for exchanges associated with a
263 * @fsp: The FCP packet to abort exchanges on
265 static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
270 per_cpu_ptr(fsp->lp->stats, get_cpu())->FcpPktAborts++;
273 fsp->state |= FC_SRB_ABORT_PENDING;
274 return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
278 * fc_fcp_retry_cmd() - Retry a fcp_pkt
279 * @fsp: The FCP packet to be retried
281 * Sets the status code to be FC_ERROR and then calls
282 * fc_fcp_complete_locked() which in turn calls fc_io_compl().
283 * fc_io_compl() will notify the SCSI-ml that the I/O is done.
284 * The SCSI-ml will retry the command.
286 static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
289 fsp->lp->tt.exch_done(fsp->seq_ptr);
293 fsp->state &= ~FC_SRB_ABORT_PENDING;
295 fsp->status_code = FC_ERROR;
296 fc_fcp_complete_locked(fsp);
300 * fc_fcp_ddp_setup() - Calls a LLD's ddp_setup routine to set up DDP context
301 * @fsp: The FCP packet that will manage the DDP frames
302 * @xid: The XID that will be used for the DDP exchange
304 void fc_fcp_ddp_setup(struct fc_fcp_pkt *fsp, u16 xid)
306 struct fc_lport *lport;
309 if ((fsp->req_flags & FC_SRB_READ) &&
310 (lport->lro_enabled) && (lport->tt.ddp_setup)) {
311 if (lport->tt.ddp_setup(lport, xid, scsi_sglist(fsp->cmd),
312 scsi_sg_count(fsp->cmd)))
318 * fc_fcp_ddp_done() - Calls a LLD's ddp_done routine to release any
319 * DDP related resources for a fcp_pkt
320 * @fsp: The FCP packet that DDP had been used on
322 void fc_fcp_ddp_done(struct fc_fcp_pkt *fsp)
324 struct fc_lport *lport;
329 if (fsp->xfer_ddp == FC_XID_UNKNOWN)
333 if (lport->tt.ddp_done) {
334 fsp->xfer_len = lport->tt.ddp_done(lport, fsp->xfer_ddp);
335 fsp->xfer_ddp = FC_XID_UNKNOWN;
340 * fc_fcp_can_queue_ramp_up() - increases can_queue
341 * @lport: lport to ramp up can_queue
343 static void fc_fcp_can_queue_ramp_up(struct fc_lport *lport)
345 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
349 spin_lock_irqsave(lport->host->host_lock, flags);
351 if (si->last_can_queue_ramp_up_time &&
352 (time_before(jiffies, si->last_can_queue_ramp_up_time +
353 FC_CAN_QUEUE_PERIOD)))
356 if (time_before(jiffies, si->last_can_queue_ramp_down_time +
357 FC_CAN_QUEUE_PERIOD))
360 si->last_can_queue_ramp_up_time = jiffies;
362 can_queue = lport->host->can_queue << 1;
363 if (can_queue >= si->max_can_queue) {
364 can_queue = si->max_can_queue;
365 si->last_can_queue_ramp_down_time = 0;
367 lport->host->can_queue = can_queue;
368 shost_printk(KERN_ERR, lport->host, "libfc: increased "
369 "can_queue to %d.\n", can_queue);
372 spin_unlock_irqrestore(lport->host->host_lock, flags);
376 * fc_fcp_can_queue_ramp_down() - reduces can_queue
377 * @lport: lport to reduce can_queue
379 * If we are getting memory allocation failures, then we may
380 * be trying to execute too many commands. We let the running
381 * commands complete or timeout, then try again with a reduced
382 * can_queue. Eventually we will hit the point where we run
383 * on all reserved structs.
385 static void fc_fcp_can_queue_ramp_down(struct fc_lport *lport)
387 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
391 spin_lock_irqsave(lport->host->host_lock, flags);
393 if (si->last_can_queue_ramp_down_time &&
394 (time_before(jiffies, si->last_can_queue_ramp_down_time +
395 FC_CAN_QUEUE_PERIOD)))
398 si->last_can_queue_ramp_down_time = jiffies;
400 can_queue = lport->host->can_queue;
404 lport->host->can_queue = can_queue;
405 shost_printk(KERN_ERR, lport->host, "libfc: Could not allocate frame.\n"
406 "Reducing can_queue to %d.\n", can_queue);
409 spin_unlock_irqrestore(lport->host->host_lock, flags);
413 * fc_fcp_frame_alloc() - Allocates fc_frame structure and buffer.
414 * @lport: fc lport struct
415 * @len: payload length
417 * Allocates fc_frame structure and buffer but if fails to allocate
418 * then reduce can_queue.
420 static inline struct fc_frame *fc_fcp_frame_alloc(struct fc_lport *lport,
425 fp = fc_frame_alloc(lport, len);
429 per_cpu_ptr(lport->stats, get_cpu())->FcpFrameAllocFails++;
432 fc_fcp_can_queue_ramp_down(lport);
437 * fc_fcp_recv_data() - Handler for receiving SCSI-FCP data from a target
438 * @fsp: The FCP packet the data is on
439 * @fp: The data frame
441 static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
443 struct scsi_cmnd *sc = fsp->cmd;
444 struct fc_lport *lport = fsp->lp;
445 struct fc_stats *stats;
446 struct fc_frame_header *fh;
453 struct scatterlist *sg;
455 u8 host_bcode = FC_COMPLETE;
457 fh = fc_frame_header_get(fp);
458 offset = ntohl(fh->fh_parm_offset);
459 start_offset = offset;
460 len = fr_len(fp) - sizeof(*fh);
461 buf = fc_frame_payload_get(fp, 0);
464 * if this I/O is ddped then clear it and initiate recovery since data
465 * frames are expected to be placed directly in that case.
467 * Indicate error to scsi-ml because something went wrong with the
468 * ddp handling to get us here.
470 if (fsp->xfer_ddp != FC_XID_UNKNOWN) {
471 fc_fcp_ddp_done(fsp);
472 FC_FCP_DBG(fsp, "DDP I/O in fc_fcp_recv_data set ERROR\n");
473 host_bcode = FC_ERROR;
476 if (offset + len > fsp->data_len) {
477 /* this should never happen */
478 if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
479 fc_frame_crc_check(fp))
481 FC_FCP_DBG(fsp, "data received past end. len %zx offset %zx "
482 "data_len %x\n", len, offset, fsp->data_len);
484 /* Data is corrupted indicate scsi-ml should retry */
485 host_bcode = FC_DATA_OVRRUN;
488 if (offset != fsp->xfer_len)
489 fsp->state |= FC_SRB_DISCONTIG;
491 sg = scsi_sglist(sc);
492 nents = scsi_sg_count(sc);
494 if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED)) {
495 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
498 crc = crc32(~0, (u8 *) fh, sizeof(*fh));
499 copy_len = fc_copy_buffer_to_sglist(buf, len, sg, &nents,
501 buf = fc_frame_payload_get(fp, 0);
503 crc = crc32(crc, buf + len, 4 - (len % 4));
505 if (~crc != le32_to_cpu(fr_crc(fp))) {
507 stats = per_cpu_ptr(lport->stats, get_cpu());
508 stats->ErrorFrames++;
509 /* per cpu count, not total count, but OK for limit */
510 if (stats->InvalidCRCCount++ < FC_MAX_ERROR_CNT)
511 printk(KERN_WARNING "libfc: CRC error on data "
512 "frame for port (%6.6x)\n",
516 * Assume the frame is total garbage.
517 * We may have copied it over the good part
519 * If so, we need to retry the entire operation.
520 * Otherwise, ignore it.
522 if (fsp->state & FC_SRB_DISCONTIG) {
523 host_bcode = FC_CRC_ERROR;
530 if (fsp->xfer_contig_end == start_offset)
531 fsp->xfer_contig_end += copy_len;
532 fsp->xfer_len += copy_len;
535 * In the very rare event that this data arrived after the response
536 * and completes the transfer, call the completion handler.
538 if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
539 fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
540 fc_fcp_complete_locked(fsp);
543 fc_fcp_recovery(fsp, host_bcode);
547 * fc_fcp_send_data() - Send SCSI data to a target
548 * @fsp: The FCP packet the data is on
549 * @sp: The sequence the data is to be sent on
550 * @offset: The starting offset for this data request
551 * @seq_blen: The burst length for this data request
553 * Called after receiving a Transfer Ready data descriptor.
554 * If the LLD is capable of sequence offload then send down the
555 * seq_blen amount of data in single frame, otherwise send
556 * multiple frames of the maximum frame payload supported by
559 static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *seq,
560 size_t offset, size_t seq_blen)
563 struct scsi_cmnd *sc;
564 struct scatterlist *sg;
565 struct fc_frame *fp = NULL;
566 struct fc_lport *lport = fsp->lp;
572 size_t frame_offset, fh_parm_offset;
577 int using_sg = lport->sg_supp;
580 WARN_ON(seq_blen <= 0);
581 if (unlikely(offset + seq_blen > fsp->data_len)) {
582 /* this should never happen */
583 FC_FCP_DBG(fsp, "xfer-ready past end. seq_blen %zx "
584 "offset %zx\n", seq_blen, offset);
585 fc_fcp_send_abort(fsp);
587 } else if (offset != fsp->xfer_len) {
588 /* Out of Order Data Request - no problem, but unexpected. */
589 FC_FCP_DBG(fsp, "xfer-ready non-contiguous. "
590 "seq_blen %zx offset %zx\n", seq_blen, offset);
594 * if LLD is capable of seq_offload then set transport
595 * burst length (t_blen) to seq_blen, otherwise set t_blen
596 * to max FC frame payload previously set in fsp->max_payload.
598 t_blen = fsp->max_payload;
599 if (lport->seq_offload) {
600 t_blen = min(seq_blen, (size_t)lport->lso_max);
601 FC_FCP_DBG(fsp, "fsp=%p:lso:blen=%zx lso_max=0x%x t_blen=%zx\n",
602 fsp, seq_blen, lport->lso_max, t_blen);
606 t_blen &= ~(512 - 1); /* round down to block size */
609 remaining = seq_blen;
610 fh_parm_offset = frame_offset = offset;
612 seq = lport->tt.seq_start_next(seq);
613 f_ctl = FC_FC_REL_OFF;
616 sg = scsi_sglist(sc);
618 while (remaining > 0 && sg) {
619 if (offset >= sg->length) {
620 offset -= sg->length;
625 tlen = min(t_blen, remaining);
628 * TODO. Temporary workaround. fc_seq_send() can't
629 * handle odd lengths in non-linear skbs.
630 * This will be the final fragment only.
634 fp = fc_frame_alloc(lport, using_sg ? 0 : tlen);
638 data = fc_frame_header_get(fp) + 1;
639 fh_parm_offset = frame_offset;
640 fr_max_payload(fp) = fsp->max_payload;
643 off = offset + sg->offset;
644 sg_bytes = min(tlen, sg->length - offset);
645 sg_bytes = min(sg_bytes,
646 (size_t) (PAGE_SIZE - (off & ~PAGE_MASK)));
647 page = sg_page(sg) + (off >> PAGE_SHIFT);
650 skb_fill_page_desc(fp_skb(fp),
651 skb_shinfo(fp_skb(fp))->nr_frags,
652 page, off & ~PAGE_MASK, sg_bytes);
653 fp_skb(fp)->data_len += sg_bytes;
654 fr_len(fp) += sg_bytes;
655 fp_skb(fp)->truesize += PAGE_SIZE;
658 * The scatterlist item may be bigger than PAGE_SIZE,
659 * but we must not cross pages inside the kmap.
661 page_addr = kmap_atomic(page);
662 memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
664 kunmap_atomic(page_addr);
668 frame_offset += sg_bytes;
670 remaining -= sg_bytes;
672 if ((skb_shinfo(fp_skb(fp))->nr_frags < FC_FRAME_SG_LEN) &&
677 * Send sequence with transfer sequence initiative in case
678 * this is last FCP frame of the sequence.
681 f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
683 ep = fc_seq_exch(seq);
684 fc_fill_fc_hdr(fp, FC_RCTL_DD_SOL_DATA, ep->did, ep->sid,
685 FC_TYPE_FCP, f_ctl, fh_parm_offset);
688 * send fragment using for a sequence.
690 error = lport->tt.seq_send(lport, seq, fp);
692 WARN_ON(1); /* send error should be rare */
697 fsp->xfer_len += seq_blen; /* premature count? */
702 * fc_fcp_abts_resp() - Receive an ABTS response
703 * @fsp: The FCP packet that is being aborted
704 * @fp: The response frame
706 static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
709 struct fc_ba_rjt *brp;
710 struct fc_frame_header *fh;
712 fh = fc_frame_header_get(fp);
713 switch (fh->fh_r_ctl) {
717 brp = fc_frame_payload_get(fp, sizeof(*brp));
718 if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
723 * we will let the command timeout
724 * and scsi-ml recover in this case,
725 * therefore cleared the ba_done flag.
731 fsp->state |= FC_SRB_ABORTED;
732 fsp->state &= ~FC_SRB_ABORT_PENDING;
734 if (fsp->wait_for_comp)
735 complete(&fsp->tm_done);
737 fc_fcp_complete_locked(fsp);
742 * fc_fcp_recv() - Receive an FCP frame
743 * @seq: The sequence the frame is on
744 * @fp: The received frame
745 * @arg: The related FCP packet
747 * Context: Called from Soft IRQ context. Can not be called
748 * holding the FCP packet list lock.
750 static void fc_fcp_recv(struct fc_seq *seq, struct fc_frame *fp, void *arg)
752 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
753 struct fc_lport *lport = fsp->lp;
754 struct fc_frame_header *fh;
755 struct fcp_txrdy *dd;
760 fc_fcp_error(fsp, fp);
764 fh = fc_frame_header_get(fp);
765 r_ctl = fh->fh_r_ctl;
767 if (lport->state != LPORT_ST_READY)
769 if (fc_fcp_lock_pkt(fsp))
772 if (fh->fh_type == FC_TYPE_BLS) {
773 fc_fcp_abts_resp(fsp, fp);
777 if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
780 if (r_ctl == FC_RCTL_DD_DATA_DESC) {
782 * received XFER RDY from the target
783 * need to send data to the target
785 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
786 dd = fc_frame_payload_get(fp, sizeof(*dd));
789 rc = fc_fcp_send_data(fsp, seq,
790 (size_t) ntohl(dd->ft_data_ro),
791 (size_t) ntohl(dd->ft_burst_len));
793 seq->rec_data = fsp->xfer_len;
794 } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
796 * received a DATA frame
797 * next we will copy the data to the system buffer
799 WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
800 fc_fcp_recv_data(fsp, fp);
801 seq->rec_data = fsp->xfer_contig_end;
802 } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
803 WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
805 fc_fcp_resp(fsp, fp);
807 FC_FCP_DBG(fsp, "unexpected frame. r_ctl %x\n", r_ctl);
810 fc_fcp_unlock_pkt(fsp);
816 * fc_fcp_resp() - Handler for FCP responses
817 * @fsp: The FCP packet the response is for
818 * @fp: The response frame
820 static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
822 struct fc_frame_header *fh;
823 struct fcp_resp *fc_rp;
824 struct fcp_resp_ext *rp_ex;
825 struct fcp_resp_rsp_info *fc_rp_info;
833 fh = (struct fc_frame_header *)fr_hdr(fp);
834 if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
837 fc_rp = (struct fcp_resp *)(fh + 1);
838 fsp->cdb_status = fc_rp->fr_status;
839 flags = fc_rp->fr_flags;
840 fsp->scsi_comp_flags = flags;
841 expected_len = fsp->data_len;
843 /* if ddp, update xfer len */
844 fc_fcp_ddp_done(fsp);
846 if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
847 rp_ex = (void *)(fc_rp + 1);
848 if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
849 if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
851 fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
852 if (flags & FCP_RSP_LEN_VAL) {
853 respl = ntohl(rp_ex->fr_rsp_len);
854 if ((respl != FCP_RESP_RSP_INFO_LEN4) &&
855 (respl != FCP_RESP_RSP_INFO_LEN8))
857 if (fsp->wait_for_comp) {
858 /* Abuse cdb_status for rsp code */
859 fsp->cdb_status = fc_rp_info->rsp_code;
860 complete(&fsp->tm_done);
862 * tmfs will not have any scsi cmd so
868 if (flags & FCP_SNS_LEN_VAL) {
869 snsl = ntohl(rp_ex->fr_sns_len);
870 if (snsl > SCSI_SENSE_BUFFERSIZE)
871 snsl = SCSI_SENSE_BUFFERSIZE;
872 memcpy(fsp->cmd->sense_buffer,
873 (char *)fc_rp_info + respl, snsl);
876 if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
877 if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
879 if (flags & FCP_RESID_UNDER) {
880 fsp->scsi_resid = ntohl(rp_ex->fr_resid);
882 * The cmnd->underflow is the minimum number of
883 * bytes that must be transferred for this
884 * command. Provided a sense condition is not
885 * present, make sure the actual amount
886 * transferred is at least the underflow value
889 if (!(flags & FCP_SNS_LEN_VAL) &&
890 (fc_rp->fr_status == 0) &&
891 (scsi_bufflen(fsp->cmd) -
892 fsp->scsi_resid) < fsp->cmd->underflow)
894 expected_len -= fsp->scsi_resid;
896 fsp->status_code = FC_ERROR;
900 fsp->state |= FC_SRB_RCV_STATUS;
903 * Check for missing or extra data frames.
905 if (unlikely(fsp->xfer_len != expected_len)) {
906 if (fsp->xfer_len < expected_len) {
908 * Some data may be queued locally,
909 * Wait a at least one jiffy to see if it is delivered.
910 * If this expires without data, we may do SRR.
912 fc_fcp_timer_set(fsp, 2);
915 fsp->status_code = FC_DATA_OVRRUN;
916 FC_FCP_DBG(fsp, "tgt %6.6x xfer len %zx greater than expected, "
917 "len %x, data len %x\n",
919 fsp->xfer_len, expected_len, fsp->data_len);
921 fc_fcp_complete_locked(fsp);
925 FC_FCP_DBG(fsp, "short FCP response. flags 0x%x len %u respl %u "
926 "snsl %u\n", flags, fr_len(fp), respl, snsl);
928 fsp->status_code = FC_ERROR;
929 fc_fcp_complete_locked(fsp);
933 * fc_fcp_complete_locked() - Complete processing of a fcp_pkt with the
935 * @fsp: The FCP packet to be completed
937 * This function may sleep if a timer is pending. The packet lock must be
938 * held, and the host lock must not be held.
940 static void fc_fcp_complete_locked(struct fc_fcp_pkt *fsp)
942 struct fc_lport *lport = fsp->lp;
947 if (fsp->state & FC_SRB_ABORT_PENDING)
950 if (fsp->state & FC_SRB_ABORTED) {
951 if (!fsp->status_code)
952 fsp->status_code = FC_CMD_ABORTED;
955 * Test for transport underrun, independent of response
958 if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
959 (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
960 fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
961 fsp->status_code = FC_DATA_UNDRUN;
969 if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
970 struct fc_frame *conf_frame;
973 csp = lport->tt.seq_start_next(seq);
974 conf_frame = fc_fcp_frame_alloc(fsp->lp, 0);
976 f_ctl = FC_FC_SEQ_INIT;
977 f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
978 ep = fc_seq_exch(seq);
979 fc_fill_fc_hdr(conf_frame, FC_RCTL_DD_SOL_CTL,
981 FC_TYPE_FCP, f_ctl, 0);
982 lport->tt.seq_send(lport, csp, conf_frame);
985 lport->tt.exch_done(seq);
988 * Some resets driven by SCSI are not I/Os and do not have
989 * SCSI commands associated with the requests. We should not
990 * call I/O completion if we do not have a SCSI command.
997 * fc_fcp_cleanup_cmd() - Cancel the active exchange on a fcp_pkt
998 * @fsp: The FCP packet whose exchanges should be canceled
999 * @error: The reason for the cancellation
1001 static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
1003 struct fc_lport *lport = fsp->lp;
1006 lport->tt.exch_done(fsp->seq_ptr);
1007 fsp->seq_ptr = NULL;
1009 fsp->status_code = error;
1013 * fc_fcp_cleanup_each_cmd() - Cancel all exchanges on a local port
1014 * @lport: The local port whose exchanges should be canceled
1015 * @id: The target's ID
1017 * @error: The reason for cancellation
1019 * If lun or id is -1, they are ignored.
1021 static void fc_fcp_cleanup_each_cmd(struct fc_lport *lport, unsigned int id,
1022 unsigned int lun, int error)
1024 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1025 struct fc_fcp_pkt *fsp;
1026 struct scsi_cmnd *sc_cmd;
1027 unsigned long flags;
1029 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1031 list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
1033 if (id != -1 && scmd_id(sc_cmd) != id)
1036 if (lun != -1 && sc_cmd->device->lun != lun)
1039 fc_fcp_pkt_hold(fsp);
1040 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1042 if (!fc_fcp_lock_pkt(fsp)) {
1043 fc_fcp_cleanup_cmd(fsp, error);
1045 fc_fcp_unlock_pkt(fsp);
1048 fc_fcp_pkt_release(fsp);
1049 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1051 * while we dropped the lock multiple pkts could
1052 * have been released, so we have to start over.
1056 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1060 * fc_fcp_abort_io() - Abort all FCP-SCSI exchanges on a local port
1061 * @lport: The local port whose exchanges are to be aborted
1063 static void fc_fcp_abort_io(struct fc_lport *lport)
1065 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_HRD_ERROR);
1069 * fc_fcp_pkt_send() - Send a fcp_pkt
1070 * @lport: The local port to send the FCP packet on
1071 * @fsp: The FCP packet to send
1073 * Return: Zero for success and -1 for failure
1074 * Locks: Called without locks held
1076 static int fc_fcp_pkt_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp)
1078 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
1079 unsigned long flags;
1082 fsp->cmd->SCp.ptr = (char *)fsp;
1083 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1084 fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
1086 int_to_scsilun(fsp->cmd->device->lun, &fsp->cdb_cmd.fc_lun);
1087 memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
1089 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1090 list_add_tail(&fsp->list, &si->scsi_pkt_queue);
1091 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1092 rc = lport->tt.fcp_cmd_send(lport, fsp, fc_fcp_recv);
1094 spin_lock_irqsave(&si->scsi_queue_lock, flags);
1095 fsp->cmd->SCp.ptr = NULL;
1096 list_del(&fsp->list);
1097 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
1104 * get_fsp_rec_tov() - Helper function to get REC_TOV
1105 * @fsp: the FCP packet
1107 * Returns rec tov in jiffies as rpriv->e_d_tov + 1 second
1109 static inline unsigned int get_fsp_rec_tov(struct fc_fcp_pkt *fsp)
1111 struct fc_rport_libfc_priv *rpriv = fsp->rport->dd_data;
1113 return msecs_to_jiffies(rpriv->e_d_tov) + HZ;
1117 * fc_fcp_cmd_send() - Send a FCP command
1118 * @lport: The local port to send the command on
1119 * @fsp: The FCP packet the command is on
1120 * @resp: The handler for the response
1122 static int fc_fcp_cmd_send(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1123 void (*resp)(struct fc_seq *,
1124 struct fc_frame *fp,
1127 struct fc_frame *fp;
1129 struct fc_rport *rport;
1130 struct fc_rport_libfc_priv *rpriv;
1131 const size_t len = sizeof(fsp->cdb_cmd);
1134 if (fc_fcp_lock_pkt(fsp))
1137 fp = fc_fcp_frame_alloc(lport, sizeof(fsp->cdb_cmd));
1143 memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
1146 fsp->max_payload = rport->maxframe_size;
1147 rpriv = rport->dd_data;
1149 fc_fill_fc_hdr(fp, FC_RCTL_DD_UNSOL_CMD, rport->port_id,
1150 rpriv->local_port->port_id, FC_TYPE_FCP,
1153 seq = lport->tt.exch_seq_send(lport, fp, resp, fc_fcp_pkt_destroy,
1160 fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
1162 setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
1163 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1164 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1167 fc_fcp_unlock_pkt(fsp);
1172 * fc_fcp_error() - Handler for FCP layer errors
1173 * @fsp: The FCP packet the error is on
1174 * @fp: The frame that has errored
1176 static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1178 int error = PTR_ERR(fp);
1180 if (fc_fcp_lock_pkt(fsp))
1183 if (error == -FC_EX_CLOSED) {
1184 fc_fcp_retry_cmd(fsp);
1189 * clear abort pending, because the lower layer
1190 * decided to force completion.
1192 fsp->state &= ~FC_SRB_ABORT_PENDING;
1193 fsp->status_code = FC_CMD_PLOGO;
1194 fc_fcp_complete_locked(fsp);
1196 fc_fcp_unlock_pkt(fsp);
1200 * fc_fcp_pkt_abort() - Abort a fcp_pkt
1201 * @fsp: The FCP packet to abort on
1203 * Called to send an abort and then wait for abort completion
1205 static int fc_fcp_pkt_abort(struct fc_fcp_pkt *fsp)
1208 unsigned long ticks_left;
1210 if (fc_fcp_send_abort(fsp))
1213 init_completion(&fsp->tm_done);
1214 fsp->wait_for_comp = 1;
1216 spin_unlock_bh(&fsp->scsi_pkt_lock);
1217 ticks_left = wait_for_completion_timeout(&fsp->tm_done,
1219 spin_lock_bh(&fsp->scsi_pkt_lock);
1220 fsp->wait_for_comp = 0;
1223 FC_FCP_DBG(fsp, "target abort cmd failed\n");
1224 } else if (fsp->state & FC_SRB_ABORTED) {
1225 FC_FCP_DBG(fsp, "target abort cmd passed\n");
1227 fc_fcp_complete_locked(fsp);
1234 * fc_lun_reset_send() - Send LUN reset command
1235 * @data: The FCP packet that identifies the LUN to be reset
1237 static void fc_lun_reset_send(unsigned long data)
1239 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1240 struct fc_lport *lport = fsp->lp;
1242 if (lport->tt.fcp_cmd_send(lport, fsp, fc_tm_done)) {
1243 if (fsp->recov_retry++ >= FC_MAX_RECOV_RETRY)
1245 if (fc_fcp_lock_pkt(fsp))
1247 setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
1248 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1249 fc_fcp_unlock_pkt(fsp);
1254 * fc_lun_reset() - Send a LUN RESET command to a device
1255 * and wait for the reply
1256 * @lport: The local port to sent the command on
1257 * @fsp: The FCP packet that identifies the LUN to be reset
1258 * @id: The SCSI command ID
1259 * @lun: The LUN ID to be reset
1261 static int fc_lun_reset(struct fc_lport *lport, struct fc_fcp_pkt *fsp,
1262 unsigned int id, unsigned int lun)
1266 fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
1267 fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
1268 int_to_scsilun(lun, &fsp->cdb_cmd.fc_lun);
1270 fsp->wait_for_comp = 1;
1271 init_completion(&fsp->tm_done);
1273 fc_lun_reset_send((unsigned long)fsp);
1276 * wait for completion of reset
1277 * after that make sure all commands are terminated
1279 rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
1281 spin_lock_bh(&fsp->scsi_pkt_lock);
1282 fsp->state |= FC_SRB_COMPL;
1283 spin_unlock_bh(&fsp->scsi_pkt_lock);
1285 del_timer_sync(&fsp->timer);
1287 spin_lock_bh(&fsp->scsi_pkt_lock);
1289 lport->tt.exch_done(fsp->seq_ptr);
1290 fsp->seq_ptr = NULL;
1292 fsp->wait_for_comp = 0;
1293 spin_unlock_bh(&fsp->scsi_pkt_lock);
1296 FC_SCSI_DBG(lport, "lun reset failed\n");
1300 /* cdb_status holds the tmf's rsp code */
1301 if (fsp->cdb_status != FCP_TMF_CMPL)
1304 FC_SCSI_DBG(lport, "lun reset to lun %u completed\n", lun);
1305 fc_fcp_cleanup_each_cmd(lport, id, lun, FC_CMD_ABORTED);
1310 * fc_tm_done() - Task Management response handler
1311 * @seq: The sequence that the response is on
1312 * @fp: The response frame
1313 * @arg: The FCP packet the response is for
1315 static void fc_tm_done(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1317 struct fc_fcp_pkt *fsp = arg;
1318 struct fc_frame_header *fh;
1322 * If there is an error just let it timeout or wait
1323 * for TMF to be aborted if it timedout.
1325 * scsi-eh will escalate for when either happens.
1330 if (fc_fcp_lock_pkt(fsp))
1334 * raced with eh timeout handler.
1336 if (!fsp->seq_ptr || !fsp->wait_for_comp)
1339 fh = fc_frame_header_get(fp);
1340 if (fh->fh_type != FC_TYPE_BLS)
1341 fc_fcp_resp(fsp, fp);
1342 fsp->seq_ptr = NULL;
1343 fsp->lp->tt.exch_done(seq);
1345 fc_fcp_unlock_pkt(fsp);
1351 * fc_fcp_cleanup() - Cleanup all FCP exchanges on a local port
1352 * @lport: The local port to be cleaned up
1354 static void fc_fcp_cleanup(struct fc_lport *lport)
1356 fc_fcp_cleanup_each_cmd(lport, -1, -1, FC_ERROR);
1360 * fc_fcp_timeout() - Handler for fcp_pkt timeouts
1361 * @data: The FCP packet that has timed out
1363 * If REC is supported then just issue it and return. The REC exchange will
1364 * complete or time out and recovery can continue at that point. Otherwise,
1365 * if the response has been received without all the data it has been
1366 * ER_TIMEOUT since the response was received. If the response has not been
1367 * received we see if data was received recently. If it has been then we
1368 * continue waiting, otherwise, we abort the command.
1370 static void fc_fcp_timeout(unsigned long data)
1372 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
1373 struct fc_rport *rport = fsp->rport;
1374 struct fc_rport_libfc_priv *rpriv = rport->dd_data;
1376 if (fc_fcp_lock_pkt(fsp))
1379 if (fsp->cdb_cmd.fc_tm_flags)
1382 fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
1384 if (rpriv->flags & FC_RP_FLAGS_REC_SUPPORTED)
1386 else if (fsp->state & FC_SRB_RCV_STATUS)
1387 fc_fcp_complete_locked(fsp);
1389 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1390 fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
1392 fc_fcp_unlock_pkt(fsp);
1396 * fc_fcp_rec() - Send a REC ELS request
1397 * @fsp: The FCP packet to send the REC request on
1399 static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
1401 struct fc_lport *lport;
1402 struct fc_frame *fp;
1403 struct fc_rport *rport;
1404 struct fc_rport_libfc_priv *rpriv;
1408 rpriv = rport->dd_data;
1409 if (!fsp->seq_ptr || rpriv->rp_state != RPORT_ST_READY) {
1410 fsp->status_code = FC_HRD_ERROR;
1412 fc_fcp_complete_locked(fsp);
1416 fp = fc_fcp_frame_alloc(lport, sizeof(struct fc_els_rec));
1420 fr_seq(fp) = fsp->seq_ptr;
1421 fc_fill_fc_hdr(fp, FC_RCTL_ELS_REQ, rport->port_id,
1422 rpriv->local_port->port_id, FC_TYPE_ELS,
1424 if (lport->tt.elsct_send(lport, rport->port_id, fp, ELS_REC,
1425 fc_fcp_rec_resp, fsp,
1426 2 * lport->r_a_tov)) {
1427 fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
1431 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1432 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1434 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1438 * fc_fcp_rec_resp() - Handler for REC ELS responses
1439 * @seq: The sequence the response is on
1440 * @fp: The response frame
1441 * @arg: The FCP packet the response is on
1443 * If the response is a reject then the scsi layer will handle
1444 * the timeout. If the response is a LS_ACC then if the I/O was not completed
1445 * set the timeout and return. If the I/O was completed then complete the
1446 * exchange and tell the SCSI layer.
1448 static void fc_fcp_rec_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1450 struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
1451 struct fc_els_rec_acc *recp;
1452 struct fc_els_ls_rjt *rjt;
1456 enum dma_data_direction data_dir;
1458 struct fc_rport_libfc_priv *rpriv;
1461 fc_fcp_rec_error(fsp, fp);
1465 if (fc_fcp_lock_pkt(fsp))
1468 fsp->recov_retry = 0;
1469 opcode = fc_frame_payload_op(fp);
1470 if (opcode == ELS_LS_RJT) {
1471 rjt = fc_frame_payload_get(fp, sizeof(*rjt));
1472 switch (rjt->er_reason) {
1474 FC_FCP_DBG(fsp, "device %x unexpected REC reject "
1475 "reason %d expl %d\n",
1476 fsp->rport->port_id, rjt->er_reason,
1480 FC_FCP_DBG(fsp, "device does not support REC\n");
1481 rpriv = fsp->rport->dd_data;
1483 * if we do not spport RECs or got some bogus
1484 * reason then resetup timer so we check for
1487 rpriv->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
1492 * If no data transfer, the command frame got dropped
1493 * so we just retry. If data was transferred, we
1494 * lost the response but the target has no record,
1495 * so we abort and retry.
1497 if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
1498 fsp->xfer_len == 0) {
1499 fc_fcp_retry_cmd(fsp);
1502 fc_fcp_recovery(fsp, FC_ERROR);
1505 } else if (opcode == ELS_LS_ACC) {
1506 if (fsp->state & FC_SRB_ABORTED)
1509 data_dir = fsp->cmd->sc_data_direction;
1510 recp = fc_frame_payload_get(fp, sizeof(*recp));
1511 offset = ntohl(recp->reca_fc4value);
1512 e_stat = ntohl(recp->reca_e_stat);
1514 if (e_stat & ESB_ST_COMPLETE) {
1517 * The exchange is complete.
1519 * For output, we must've lost the response.
1520 * For input, all data must've been sent.
1521 * We lost may have lost the response
1522 * (and a confirmation was requested) and maybe
1525 * If all data received, send SRR
1526 * asking for response. If partial data received,
1527 * or gaps, SRR requests data at start of gap.
1528 * Recovery via SRR relies on in-order-delivery.
1530 if (data_dir == DMA_TO_DEVICE) {
1531 r_ctl = FC_RCTL_DD_CMD_STATUS;
1532 } else if (fsp->xfer_contig_end == offset) {
1533 r_ctl = FC_RCTL_DD_CMD_STATUS;
1535 offset = fsp->xfer_contig_end;
1536 r_ctl = FC_RCTL_DD_SOL_DATA;
1538 fc_fcp_srr(fsp, r_ctl, offset);
1539 } else if (e_stat & ESB_ST_SEQ_INIT) {
1541 * The remote port has the initiative, so just
1542 * keep waiting for it to complete.
1544 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1548 * The exchange is incomplete, we have seq. initiative.
1549 * Lost response with requested confirmation,
1550 * lost confirmation, lost transfer ready or
1553 * For output, if not all data was received, ask
1554 * for transfer ready to be repeated.
1556 * If we received or sent all the data, send SRR to
1559 * If we lost a response, we may have lost some read
1562 r_ctl = FC_RCTL_DD_SOL_DATA;
1563 if (data_dir == DMA_TO_DEVICE) {
1564 r_ctl = FC_RCTL_DD_CMD_STATUS;
1565 if (offset < fsp->data_len)
1566 r_ctl = FC_RCTL_DD_DATA_DESC;
1567 } else if (offset == fsp->xfer_contig_end) {
1568 r_ctl = FC_RCTL_DD_CMD_STATUS;
1569 } else if (fsp->xfer_contig_end < offset) {
1570 offset = fsp->xfer_contig_end;
1572 fc_fcp_srr(fsp, r_ctl, offset);
1576 fc_fcp_unlock_pkt(fsp);
1578 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1583 * fc_fcp_rec_error() - Handler for REC errors
1584 * @fsp: The FCP packet the error is on
1585 * @fp: The REC frame
1587 static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1589 int error = PTR_ERR(fp);
1591 if (fc_fcp_lock_pkt(fsp))
1596 fc_fcp_retry_cmd(fsp);
1600 FC_FCP_DBG(fsp, "REC %p fid %6.6x error unexpected error %d\n",
1601 fsp, fsp->rport->port_id, error);
1602 fsp->status_code = FC_CMD_PLOGO;
1605 case -FC_EX_TIMEOUT:
1607 * Assume REC or LS_ACC was lost.
1608 * The exchange manager will have aborted REC, so retry.
1610 FC_FCP_DBG(fsp, "REC fid %6.6x error error %d retry %d/%d\n",
1611 fsp->rport->port_id, error, fsp->recov_retry,
1612 FC_MAX_RECOV_RETRY);
1613 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1616 fc_fcp_recovery(fsp, FC_ERROR);
1619 fc_fcp_unlock_pkt(fsp);
1621 fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
1625 * fc_fcp_recovery() - Handler for fcp_pkt recovery
1626 * @fsp: The FCP pkt that needs to be aborted
1628 static void fc_fcp_recovery(struct fc_fcp_pkt *fsp, u8 code)
1630 fsp->status_code = code;
1631 fsp->cdb_status = 0;
1634 * if this fails then we let the scsi command timer fire and
1637 fc_fcp_send_abort(fsp);
1641 * fc_fcp_srr() - Send a SRR request (Sequence Retransmission Request)
1642 * @fsp: The FCP packet the SRR is to be sent on
1643 * @r_ctl: The R_CTL field for the SRR request
1644 * This is called after receiving status but insufficient data, or
1645 * when expecting status but the request has timed out.
1647 static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
1649 struct fc_lport *lport = fsp->lp;
1650 struct fc_rport *rport;
1651 struct fc_rport_libfc_priv *rpriv;
1652 struct fc_exch *ep = fc_seq_exch(fsp->seq_ptr);
1654 struct fcp_srr *srr;
1655 struct fc_frame *fp;
1656 unsigned int rec_tov;
1659 rpriv = rport->dd_data;
1661 if (!(rpriv->flags & FC_RP_FLAGS_RETRY) ||
1662 rpriv->rp_state != RPORT_ST_READY)
1663 goto retry; /* shouldn't happen */
1664 fp = fc_fcp_frame_alloc(lport, sizeof(*srr));
1668 srr = fc_frame_payload_get(fp, sizeof(*srr));
1669 memset(srr, 0, sizeof(*srr));
1670 srr->srr_op = ELS_SRR;
1671 srr->srr_ox_id = htons(ep->oxid);
1672 srr->srr_rx_id = htons(ep->rxid);
1673 srr->srr_r_ctl = r_ctl;
1674 srr->srr_rel_off = htonl(offset);
1676 fc_fill_fc_hdr(fp, FC_RCTL_ELS4_REQ, rport->port_id,
1677 rpriv->local_port->port_id, FC_TYPE_FCP,
1680 rec_tov = get_fsp_rec_tov(fsp);
1681 seq = lport->tt.exch_seq_send(lport, fp, fc_fcp_srr_resp,
1683 fsp, jiffies_to_msecs(rec_tov));
1687 fsp->recov_seq = seq;
1688 fsp->xfer_len = offset;
1689 fsp->xfer_contig_end = offset;
1690 fsp->state &= ~FC_SRB_RCV_STATUS;
1691 fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
1694 fc_fcp_retry_cmd(fsp);
1698 * fc_fcp_srr_resp() - Handler for SRR response
1699 * @seq: The sequence the SRR is on
1700 * @fp: The SRR frame
1701 * @arg: The FCP packet the SRR is on
1703 static void fc_fcp_srr_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
1705 struct fc_fcp_pkt *fsp = arg;
1706 struct fc_frame_header *fh;
1709 fc_fcp_srr_error(fsp, fp);
1713 if (fc_fcp_lock_pkt(fsp))
1716 fh = fc_frame_header_get(fp);
1718 * BUG? fc_fcp_srr_error calls exch_done which would release
1719 * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
1720 * then fc_exch_timeout would be sending an abort. The exch_done
1721 * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
1722 * an abort response though.
1724 if (fh->fh_type == FC_TYPE_BLS) {
1725 fc_fcp_unlock_pkt(fsp);
1729 switch (fc_frame_payload_op(fp)) {
1731 fsp->recov_retry = 0;
1732 fc_fcp_timer_set(fsp, get_fsp_rec_tov(fsp));
1736 fc_fcp_recovery(fsp, FC_ERROR);
1739 fc_fcp_unlock_pkt(fsp);
1741 fsp->lp->tt.exch_done(seq);
1746 * fc_fcp_srr_error() - Handler for SRR errors
1747 * @fsp: The FCP packet that the SRR error is on
1748 * @fp: The SRR frame
1750 static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
1752 if (fc_fcp_lock_pkt(fsp))
1754 switch (PTR_ERR(fp)) {
1755 case -FC_EX_TIMEOUT:
1756 if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
1759 fc_fcp_recovery(fsp, FC_TIMED_OUT);
1761 case -FC_EX_CLOSED: /* e.g., link failure */
1764 fc_fcp_retry_cmd(fsp);
1767 fc_fcp_unlock_pkt(fsp);
1769 fsp->lp->tt.exch_done(fsp->recov_seq);
1773 * fc_fcp_lport_queue_ready() - Determine if the lport and it's queue is ready
1774 * @lport: The local port to be checked
1776 static inline int fc_fcp_lport_queue_ready(struct fc_lport *lport)
1779 return (lport->state == LPORT_ST_READY) &&
1780 lport->link_up && !lport->qfull;
1784 * fc_queuecommand() - The queuecommand function of the SCSI template
1785 * @shost: The Scsi_Host that the command was issued to
1786 * @cmd: The scsi_cmnd to be executed
1788 * This is the i/o strategy routine, called by the SCSI layer.
1790 int fc_queuecommand(struct Scsi_Host *shost, struct scsi_cmnd *sc_cmd)
1792 struct fc_lport *lport = shost_priv(shost);
1793 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
1794 struct fc_fcp_pkt *fsp;
1795 struct fc_rport_libfc_priv *rpriv;
1798 struct fc_stats *stats;
1800 rval = fc_remote_port_chkready(rport);
1802 sc_cmd->result = rval;
1803 sc_cmd->scsi_done(sc_cmd);
1807 if (!*(struct fc_remote_port **)rport->dd_data) {
1809 * rport is transitioning from blocked/deleted to
1812 sc_cmd->result = DID_IMM_RETRY << 16;
1813 sc_cmd->scsi_done(sc_cmd);
1817 rpriv = rport->dd_data;
1819 if (!fc_fcp_lport_queue_ready(lport)) {
1821 fc_fcp_can_queue_ramp_down(lport);
1822 rc = SCSI_MLQUEUE_HOST_BUSY;
1826 fsp = fc_fcp_pkt_alloc(lport, GFP_ATOMIC);
1828 rc = SCSI_MLQUEUE_HOST_BUSY;
1833 * build the libfc request pkt
1835 fsp->cmd = sc_cmd; /* save the cmd */
1836 fsp->rport = rport; /* set the remote port ptr */
1839 * set up the transfer length
1841 fsp->data_len = scsi_bufflen(sc_cmd);
1845 * setup the data direction
1847 stats = per_cpu_ptr(lport->stats, get_cpu());
1848 if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
1849 fsp->req_flags = FC_SRB_READ;
1850 stats->InputRequests++;
1851 stats->InputBytes += fsp->data_len;
1852 } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
1853 fsp->req_flags = FC_SRB_WRITE;
1854 stats->OutputRequests++;
1855 stats->OutputBytes += fsp->data_len;
1858 stats->ControlRequests++;
1863 * send it to the lower layer
1864 * if we get -1 return then put the request in the pending
1867 rval = fc_fcp_pkt_send(lport, fsp);
1869 fsp->state = FC_SRB_FREE;
1870 fc_fcp_pkt_release(fsp);
1871 rc = SCSI_MLQUEUE_HOST_BUSY;
1876 EXPORT_SYMBOL(fc_queuecommand);
1879 * fc_io_compl() - Handle responses for completed commands
1880 * @fsp: The FCP packet that is complete
1882 * Translates fcp_pkt errors to a Linux SCSI errors.
1883 * The fcp packet lock must be held when calling.
1885 static void fc_io_compl(struct fc_fcp_pkt *fsp)
1887 struct fc_fcp_internal *si;
1888 struct scsi_cmnd *sc_cmd;
1889 struct fc_lport *lport;
1890 unsigned long flags;
1892 /* release outstanding ddp context */
1893 fc_fcp_ddp_done(fsp);
1895 fsp->state |= FC_SRB_COMPL;
1896 if (!(fsp->state & FC_SRB_FCP_PROCESSING_TMO)) {
1897 spin_unlock_bh(&fsp->scsi_pkt_lock);
1898 del_timer_sync(&fsp->timer);
1899 spin_lock_bh(&fsp->scsi_pkt_lock);
1903 si = fc_get_scsi_internal(lport);
1906 * if can_queue ramp down is done then try can_queue ramp up
1907 * since commands are completing now.
1909 if (si->last_can_queue_ramp_down_time)
1910 fc_fcp_can_queue_ramp_up(lport);
1913 CMD_SCSI_STATUS(sc_cmd) = fsp->cdb_status;
1914 switch (fsp->status_code) {
1916 if (fsp->cdb_status == 0) {
1920 sc_cmd->result = DID_OK << 16;
1921 if (fsp->scsi_resid)
1922 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1925 * transport level I/O was ok but scsi
1926 * has non zero status
1928 sc_cmd->result = (DID_OK << 16) | fsp->cdb_status;
1932 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1933 "due to FC_ERROR\n");
1934 sc_cmd->result = DID_ERROR << 16;
1936 case FC_DATA_UNDRUN:
1937 if ((fsp->cdb_status == 0) && !(fsp->req_flags & FC_SRB_READ)) {
1939 * scsi status is good but transport level
1942 if (fsp->state & FC_SRB_RCV_STATUS) {
1943 sc_cmd->result = DID_OK << 16;
1945 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml"
1946 " due to FC_DATA_UNDRUN (trans)\n");
1947 sc_cmd->result = DID_ERROR << 16;
1951 * scsi got underrun, this is an error
1953 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1954 "due to FC_DATA_UNDRUN (scsi)\n");
1955 CMD_RESID_LEN(sc_cmd) = fsp->scsi_resid;
1956 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1959 case FC_DATA_OVRRUN:
1961 * overrun is an error
1963 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1964 "due to FC_DATA_OVRRUN\n");
1965 sc_cmd->result = (DID_ERROR << 16) | fsp->cdb_status;
1967 case FC_CMD_ABORTED:
1968 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1969 "due to FC_CMD_ABORTED\n");
1970 sc_cmd->result = (DID_ERROR << 16) | fsp->io_status;
1973 FC_FCP_DBG(fsp, "Returning DID_RESET to scsi-ml "
1974 "due to FC_CMD_RESET\n");
1975 sc_cmd->result = (DID_RESET << 16);
1978 FC_FCP_DBG(fsp, "Returning DID_NO_CONNECT to scsi-ml "
1979 "due to FC_HRD_ERROR\n");
1980 sc_cmd->result = (DID_NO_CONNECT << 16);
1983 FC_FCP_DBG(fsp, "Returning DID_PARITY to scsi-ml "
1984 "due to FC_CRC_ERROR\n");
1985 sc_cmd->result = (DID_PARITY << 16);
1988 FC_FCP_DBG(fsp, "Returning DID_BUS_BUSY to scsi-ml "
1989 "due to FC_TIMED_OUT\n");
1990 sc_cmd->result = (DID_BUS_BUSY << 16) | fsp->io_status;
1993 FC_FCP_DBG(fsp, "Returning DID_ERROR to scsi-ml "
1994 "due to unknown error\n");
1995 sc_cmd->result = (DID_ERROR << 16);
1999 if (lport->state != LPORT_ST_READY && fsp->status_code != FC_COMPLETE)
2000 sc_cmd->result = (DID_TRANSPORT_DISRUPTED << 16);
2002 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2003 list_del(&fsp->list);
2004 sc_cmd->SCp.ptr = NULL;
2005 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2006 sc_cmd->scsi_done(sc_cmd);
2008 /* release ref from initial allocation in queue command */
2009 fc_fcp_pkt_release(fsp);
2013 * fc_eh_abort() - Abort a command
2014 * @sc_cmd: The SCSI command to abort
2016 * From SCSI host template.
2017 * Send an ABTS to the target device and wait for the response.
2019 int fc_eh_abort(struct scsi_cmnd *sc_cmd)
2021 struct fc_fcp_pkt *fsp;
2022 struct fc_lport *lport;
2023 struct fc_fcp_internal *si;
2025 unsigned long flags;
2028 rval = fc_block_scsi_eh(sc_cmd);
2032 lport = shost_priv(sc_cmd->device->host);
2033 if (lport->state != LPORT_ST_READY)
2035 else if (!lport->link_up)
2038 si = fc_get_scsi_internal(lport);
2039 spin_lock_irqsave(&si->scsi_queue_lock, flags);
2040 fsp = CMD_SP(sc_cmd);
2042 /* command completed while scsi eh was setting up */
2043 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2046 /* grab a ref so the fsp and sc_cmd cannot be released from under us */
2047 fc_fcp_pkt_hold(fsp);
2048 spin_unlock_irqrestore(&si->scsi_queue_lock, flags);
2050 if (fc_fcp_lock_pkt(fsp)) {
2051 /* completed while we were waiting for timer to be deleted */
2056 rc = fc_fcp_pkt_abort(fsp);
2057 fc_fcp_unlock_pkt(fsp);
2060 fc_fcp_pkt_release(fsp);
2063 EXPORT_SYMBOL(fc_eh_abort);
2066 * fc_eh_device_reset() - Reset a single LUN
2067 * @sc_cmd: The SCSI command which identifies the device whose
2068 * LUN is to be reset
2070 * Set from SCSI host template.
2072 int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
2074 struct fc_lport *lport;
2075 struct fc_fcp_pkt *fsp;
2076 struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
2080 rval = fc_block_scsi_eh(sc_cmd);
2084 lport = shost_priv(sc_cmd->device->host);
2086 if (lport->state != LPORT_ST_READY)
2089 FC_SCSI_DBG(lport, "Resetting rport (%6.6x)\n", rport->port_id);
2091 fsp = fc_fcp_pkt_alloc(lport, GFP_NOIO);
2093 printk(KERN_WARNING "libfc: could not allocate scsi_pkt\n");
2098 * Build the libfc request pkt. Do not set the scsi cmnd, because
2099 * the sc passed in is not setup for execution like when sent
2100 * through the queuecommand callout.
2102 fsp->rport = rport; /* set the remote port ptr */
2105 * flush outstanding commands
2107 rc = fc_lun_reset(lport, fsp, scmd_id(sc_cmd), sc_cmd->device->lun);
2108 fsp->state = FC_SRB_FREE;
2109 fc_fcp_pkt_release(fsp);
2114 EXPORT_SYMBOL(fc_eh_device_reset);
2117 * fc_eh_host_reset() - Reset a Scsi_Host.
2118 * @sc_cmd: The SCSI command that identifies the SCSI host to be reset
2120 int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
2122 struct Scsi_Host *shost = sc_cmd->device->host;
2123 struct fc_lport *lport = shost_priv(shost);
2124 unsigned long wait_tmo;
2126 FC_SCSI_DBG(lport, "Resetting host\n");
2128 fc_block_scsi_eh(sc_cmd);
2130 lport->tt.lport_reset(lport);
2131 wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
2132 while (!fc_fcp_lport_queue_ready(lport) && time_before(jiffies,
2136 if (fc_fcp_lport_queue_ready(lport)) {
2137 shost_printk(KERN_INFO, shost, "libfc: Host reset succeeded "
2138 "on port (%6.6x)\n", lport->port_id);
2141 shost_printk(KERN_INFO, shost, "libfc: Host reset failed, "
2142 "port (%6.6x) is not ready.\n",
2147 EXPORT_SYMBOL(fc_eh_host_reset);
2150 * fc_slave_alloc() - Configure the queue depth of a Scsi_Host
2151 * @sdev: The SCSI device that identifies the SCSI host
2153 * Configures queue depth based on host's cmd_per_len. If not set
2154 * then we use the libfc default.
2156 int fc_slave_alloc(struct scsi_device *sdev)
2158 struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
2160 if (!rport || fc_remote_port_chkready(rport))
2163 if (sdev->tagged_supported)
2164 scsi_activate_tcq(sdev, FC_FCP_DFLT_QUEUE_DEPTH);
2166 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev),
2167 FC_FCP_DFLT_QUEUE_DEPTH);
2171 EXPORT_SYMBOL(fc_slave_alloc);
2174 * fc_change_queue_depth() - Change a device's queue depth
2175 * @sdev: The SCSI device whose queue depth is to change
2176 * @qdepth: The new queue depth
2177 * @reason: The resason for the change
2179 int fc_change_queue_depth(struct scsi_device *sdev, int qdepth, int reason)
2182 case SCSI_QDEPTH_DEFAULT:
2183 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2185 case SCSI_QDEPTH_QFULL:
2186 scsi_track_queue_full(sdev, qdepth);
2188 case SCSI_QDEPTH_RAMP_UP:
2189 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2194 return sdev->queue_depth;
2196 EXPORT_SYMBOL(fc_change_queue_depth);
2199 * fc_change_queue_type() - Change a device's queue type
2200 * @sdev: The SCSI device whose queue depth is to change
2201 * @tag_type: Identifier for queue type
2203 int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
2205 if (sdev->tagged_supported) {
2206 scsi_set_tag_type(sdev, tag_type);
2208 scsi_activate_tcq(sdev, sdev->queue_depth);
2210 scsi_deactivate_tcq(sdev, sdev->queue_depth);
2216 EXPORT_SYMBOL(fc_change_queue_type);
2219 * fc_fcp_destory() - Tear down the FCP layer for a given local port
2220 * @lport: The local port that no longer needs the FCP layer
2222 void fc_fcp_destroy(struct fc_lport *lport)
2224 struct fc_fcp_internal *si = fc_get_scsi_internal(lport);
2226 if (!list_empty(&si->scsi_pkt_queue))
2227 printk(KERN_ERR "libfc: Leaked SCSI packets when destroying "
2228 "port (%6.6x)\n", lport->port_id);
2230 mempool_destroy(si->scsi_pkt_pool);
2232 lport->scsi_priv = NULL;
2234 EXPORT_SYMBOL(fc_fcp_destroy);
2236 int fc_setup_fcp(void)
2240 scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
2241 sizeof(struct fc_fcp_pkt),
2242 0, SLAB_HWCACHE_ALIGN, NULL);
2243 if (!scsi_pkt_cachep) {
2244 printk(KERN_ERR "libfc: Unable to allocate SRB cache, "
2245 "module load failed!");
2252 void fc_destroy_fcp(void)
2254 if (scsi_pkt_cachep)
2255 kmem_cache_destroy(scsi_pkt_cachep);
2259 * fc_fcp_init() - Initialize the FCP layer for a local port
2260 * @lport: The local port to initialize the exchange layer for
2262 int fc_fcp_init(struct fc_lport *lport)
2265 struct fc_fcp_internal *si;
2267 if (!lport->tt.fcp_cmd_send)
2268 lport->tt.fcp_cmd_send = fc_fcp_cmd_send;
2270 if (!lport->tt.fcp_cleanup)
2271 lport->tt.fcp_cleanup = fc_fcp_cleanup;
2273 if (!lport->tt.fcp_abort_io)
2274 lport->tt.fcp_abort_io = fc_fcp_abort_io;
2276 si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
2279 lport->scsi_priv = si;
2280 si->max_can_queue = lport->host->can_queue;
2281 INIT_LIST_HEAD(&si->scsi_pkt_queue);
2282 spin_lock_init(&si->scsi_queue_lock);
2284 si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
2285 if (!si->scsi_pkt_pool) {
2295 EXPORT_SYMBOL(fc_fcp_init);